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Old 08-16-2022, 04:13 PM   #1
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TPMS without metal valve stems?

I purchased the TST 507 flow through TPMS about 4-5 years ago for our travel trailer, which I had metal valve stems put on when I replaced the tires. We have since purchased a 5th wheel and apparently the way the stem opening is on the wheels they cannot use metal valve stems, just the rubber ones (they're slightly recessed). While on a 10k road trip this summer we encountered a situation where one of our tires was running a little low. It turns out that the rubber valve stem was not holding up with the TPMS on it and was leaking air around the seal. My question is....is this just something I'm going to need to deal with or are there other alternatives that will work with a rubber valve stem?
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Old 08-16-2022, 06:22 PM   #2
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I have the TST 507 too. You're probably going to want to switch out those flow-thru sensors to cap sensors for the RV. I went that route for my truck (no OEM TPMS) because it has rubber valve stems from the factory. Gonna see if dealer will change them to metal at first tire change, but not sure if that is an option for my wheel type.

More info on picking the right sensor: https://youtu.be/vIIqEbkD4fQ?t=195
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Old 08-16-2022, 06:51 PM   #3
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Some aluminum wheels have a small diameter hole for the bolt in stems.
What you need are Dill 902-W
like this


I understand that Discount Tire sells the Dill valve
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Old 08-17-2022, 07:33 AM   #4
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Before we even picked up our 5th wheel (16"rims) I bought a set of Tireminder TPMS. They are much smaller than most brands and have 57,000 miles on them now with rubber valve stems and no problems so far.
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Old 08-19-2022, 11:28 AM   #5
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Cap sensors on rubber valves. 6 wheels, thousands of miles. Carry on.
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Old 08-21-2022, 10:30 PM   #6
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TST offers a internal TPMS unit that mounts to the inside of the rim.
Not the most economical choice.

This is an alternative if you can't get the correct stems.

https://technorv.com/collections/tst...-sensor-single



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Old 08-22-2022, 07:03 AM   #7
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Are you sure that you can't get metal stems installed? If the stems are just recessed a little, it seems that longer stems would be available. Although they specialize in stems for motorhomes, you might be able to get some help from the folks at https://yourtireshopsupply.com/categ...lly-valve-kits. If the stems are straight, or if you can measure any angle and the length you would need, you can probably find replacement stems.
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